Condensation pump



Fb. 26, 1946. I M. E. JOHNSON I CONDENSATION PUMP Filed Nov. 4, 1944 2 Sheets-Sheet 1 M'ERRMM E. JOHNSON TO BACKING PUMP FIG. 1-.

INVENTOR f BY ATTORNEYS led Nov. 4, 1944 2 Sheets- Sheet 2 N w N w E M INVENTOR I ATTORNEYS Patented Feb. 26, 1946 CONDENSATION' PUMP MerriamE. Johnson, Rochester, N. Y., assignor to Distillation Products; Inc., Rochester, N. Y.,-a

corporation of'Delaware Application November 4, 1944, Serial-No. 561,907

5 Claims.

This invention relates to improved condensa tionpumps particularly of the fractionating type.

Fractionating pumps are well known; see,. for instance, Hickman Patent 2,080,421. Subsequent to the invention of such pumps by Hickman, other investigators described modifications thereof; see, for instance, Malter Patent 2,112,037. Such pumps involve a plurality of jets and a plurality of boilers, and, therefore, have necessitated-rather complicated designs which are not readily reproducedn amass reproduction basis.

This invention has for its object to provide an improved multi-stage condensation pump. Another object is to provide a multi-stage fractionating condensation pump having the advantage of simplicity ofconstruction. A further object is toimpro-ve the state of the art. Other advantages will appear hereinafter.

In the following description I have set forth' certain preferred embodiments of my invention but it is to'be understood that these are given by way of illustration and not in limitation thereof.

In the accompanyingdrawings wherein I have illustrated a preferred embodiment of my invention: Fig. l is a vertical section of an improved pump; Fig. 2 is a horizontal section taken online 2-2 of Fig. 1, and Fig. 3 is a horizontal section taken on line 3-3 of Fig. 1.

Referring to the drawings, numeral llldesignates a cylindrical pump casing providedwith an integral cover I2 and an integral base [4. Nu-

merals H5 and iii-designate similarly shaped cylindri'c'alelements provided with integral covers and .22 respectively. Elements I 5 and 18 rest upon the common base l4, preferably in annular grooves 24 and 26 as illustrated. Numeral 28 provided at its upper end with an umbrella-type Jet 44. The lower end of conduit 42 is integral with c'over plate-'22 of cylinder I-Band communicates with the inside portion of said cylinder.

Numeral 4t designates a conduit which at its lower endsimilarl communicates with the inside ing pump (not shown). The spent pump fluid Conduit 34 is provided-with of cylinder i8 and whichis concentrically positioned with respect to conduit 36 So as to cooperate with conduit 35 to form an ejector type nozzle. Numerals s8 and 50 designate cooling coils through which cooling fluid is circulated to cool conduits 34 and 35 respectively. Numeral 52 designates a baille integral with conduit 42 serving to prevent condensed pump fluid from drop ping into the space between cover plate 23 and conduit 42.

Numeral 5t designates a rectangular baille' which divides cuplike member I8 into two approximately semi-cylindrical boiler compartments 53" and 6B. Numeral 56 designates an opening in the bottom of bafile 54 whereby liquid pump fluid flows from boiler compartment 58 into boiler compartment 68. Numeral 62 designates a plurality of bafiles on the base plate M in boilerlcompartment 58 causing the pump fluid to take a circuitous path in flowingtherethrough. Numeral '6 designates a plurality of baffles performing a somewhat similar function and serving to strengthen the base of boiler '60. Numeral 66 designates a body of pump fluid resting in the bottom of the pump casing. Numeral 68 designates a notch or opening in the base of cup I8 to permit the pump fluid to flow into boiler 58. Numeral lil' designates a similar opening in the lower edge of cylinder l6; Cylinders i6 and I8 otherwise make substantially leakproof contact with base plate It.

In operating the pump illustrated in the drawings, the upper end of conduit 34 is connected to the system to be evacuated. The upper end of conduit 36 is connected to a backing pump (not shown). Cooling fluid is circulated through coils 4B and 59, and heater element 28 is put into operation. Pump fluid 66 is thus vaporized, passes upwardly through chimneys 42 and it. The vapors .in are reversed by umbrella jet til and the vapors are thus directed downwardly in the form of a high velocity jet and entrain gases from the upper part of conduit 34. The gases from the system to be evacuated'are thus forced down' into the upper part of casing It). The spent pump fluid is condensed on the walls of 34, flows by gravity down the walls to the base plate It. This condensed pump fluid then flows around the annular space between casing lil'and member 1 Sand then through openings 10' and 6B.

The vapors passing upwardly through conduit 46' entrain the gases in the upper part of casing l0 and force them to the top part of conduit 36 from which point they areremcved'by the backare held in the gutters formed by bailies 4B. The

remainder of the pump fluid flows down the wall of conduit 36 dropping onto heat shield 20 and flows thence to the bottom of the annular space between casing I9 and cylinder Hi. This pump fluid is intermingled with the pump fluid from jet M and the mixture flows through openings 19 and 68 and into boiler compartment 58. Here the pump fluid flows in a circuitous path between bafiies $2 in boiler 58 and during such passage the more volatile constituents are vaporized and pass upwardly through conduit 46. The lowest vapor pressure constituents remain unvaporized and pass through opening 56 in the bottom of partition 54 and then into boiler compartment 68. Here the lowest vapor pressure constituents are vaporized and pass upwardly through conduit 42 and issue as a high velocity jet from nozzle 44. The pump thus effectively fractionates the pump fluid utilizing the high vapor pressure constituents on the high pressure side and the low vapor pressure constituents on the fine or low pressure side of the pump.

It is apparent that many modifications can be made without departing from the spirit or scope of my invention. Thus, while I have illustrated a, pump embodying two jets, it is apparent that the number of jets can be increased by division of the pumping and boiler chambers into compartments corresponding with the number of jets. Also, while I prefer to use baflies 38 and 40, these are not necessary. Baffles 40 may be placed horizontally so that they merely prevent loss of pump mass production basis, and at comparatively.

low cost. An outstanding advantage of the invention is that metal -components which can be readily stamped or turned are used in the construction. The pump can be assembled easily and will retain its good pumping characteristic during use.

What I claim is:

1. A multi-stage fractionating condensation pump comprising in combination a cylindrical pump casing provided with top and base plates integral therewith; a partition approximately parallel with the base plate dividing the pump casing into a lower boiler section and an upper section for pumped gases, means dividing the boiler section into a plurality of? boiler compartments, substantially vertical conduits mounted on the top plate of the pump casing so that they are approximately perpendicular to said plate, said conduits communicatingwith the section for Pumped gases-inside the cylindrical pump casing, and each, being positioned above one of the boiler compartments, a plurality of vapor delivery chimneys positioned so that their upper ends coe operate with said conduits to form a plurality of jet, pumps and so that their lower ends terminate in a boiler compartment, means for collecting condensed workingfluid from the jet pumps and for returningit to the boiler compartment delivering vapor to the jet pump operating against the highest pressure, and means for the pump fluid to flow from that boiler compartment to a boiler compartment supplying a jet working against a lower pressure.

2. A multi-stage fractionating condensation pump comprising in combination a cylindrical pump casing provided with top and 'base plates integral therewith, a partition approximately parallel with the base plate dividing the pump casing into a lower boiler section and an upper passageway for pumped gases, a second partition approximately perpendicular with the base plate dividing the boiler section into two boiler compartmentatwo conduits mounted on the top plate of the pump casing so that they are approximately perpendicular thereto, said conduits communicating with the passageway for pumped gases insidethe cylindrical pump casing, one of said conduits being positioned above one of the boiler compartments and the other conduit being positioned above the other boiler compartment, a chimney positioned inside of and concentric with one of said conduits, which chimney carries an umbrella jet nozzle at its upper end and communicates with one of the boiler compartments at its lowerend, a second chimney positioned so that its upper end is in ejector relation with the other conduit and communicating with the other boiler compartment at is lower end, means for collecting condensed working fluid from both jet nozzles and for returning it to the boiler communicating with the ejector jet nozzle and means for delivering fractionated working fluid from the tion and an upper passageway for pumped gases,

a second partition approximately perpendicular with the base plate dividing the boiler section into two semi-cylindrical boiler compartments, two substantially vertical conduits mounted on the top plate of the pump casing so that they are approximately perpendicular thereto, said conduits communicating with the passageway for pumped gases inside the cylindrical pump casing, one of said conduits being positioned above one of the semi-cylindrical boiler compartments and the other conduit being positioned above the other semi-cylindrical boiler compartment, a chimney positioned inside of and concentric with one of said conduits, which chimney carries an umbrella jet nozzle at its upper end and communicates with one of the semi-cylindrical boiler compartments at its lower end, a second chimney positioned concentric with the other conduit and so as to form an ejector jet nozzle at its upper end 'andcommunicating with the other semicylindrical boiler compartment at its lower end,

means for collecting condensed working fluid from both jet nozzles and for returning it to the boiler communicating with the ejector jet nozzle and means for delivering fractionated working fluid from the boiler supplying the ejector jet nozzle to the boiler supplying the umbrella jet nozzle.

4. A multi-stage fractionating condensation pump comprising in combination a plurality of nested concentric inverted cup-shaped elements having a common'base, a partition dividing the "inside cup-shaped element 'into two semi-cylindrical boiler compartments, two conduits mounted upon and approximately perpendicular to the top of the outside cup and communicating with the space inside thereof said conduits being positioned so that one conduit is above one of the 6 boiler compartments and the other conduit is above the other boiler compartment, a chimney positioned inside of and concentric with one of said conduits, which chimney carries an umbrella jet nozzle at its upper end and communicates with 10 one of the semi-cylindrical boiler compartments at its lower end, a second chimney positioned concentric with the other conduit so as to form an ejector jet nozzle at its upper end and communipartment at its lower end, means for collecting condensed working fluid from both jet nozzles and for returning it to the boiler communicating with the ejector jet nozzle and means for delivering fractionated working -fluid from the 20 boiler supplying the ejector jet nozzle to the boiler supplying the umbrella jet nozzle.

5. A multi-stage fractionating condensation pump comprising in combination three nested concentric inverted cup-shaped elements having 25 a common base, the outside cup serving as a pump casing, the middle cup as a pump fluid defiector, or heat shield and the inside cup as a boiler, a partition dividing the inside cup-shaped boiler element into two semi-cylindrical boiler compartments, two conduits mounted upon the top of the outside cup and communicating with the space inside thereof said conduits being substantially perpendicular to the common base and positioned so that one conduit is above one of the boiler compartments and the other conduit is above the other boiler compartment, a chimney positioned inside of and concentric with one of said conduits, which chimney carries an umbrella jet nozzle at its upper end and communicates with one of the semi-cylindrical boiler compartcating with the other semi-cylindrical boiler com- 15 ments at its lower end, a second chimney positioned concentric with the other conduit and cooperating therewith to form an ejector jet nozzle at its upper end and communicating with the other semi-cylindrical boiler compartment at its lower end, means for collecting spent condensed working fluid from both jet nozzles and for returning it to the boiler communicating with the ejector jet nozzle and means for delivering fractionated working fluid from the boiler supplying the ejector jet nozzle to the boiler supplying the umbrella jet nozzle.

MERRIAM E. JOHNSON. 

